Profiles of dark-matter haloes at high redshift

Details Profiles of dark-matter haloes at high redshift Profiles of dark-matter haloes at high redshift

1999-08-18

arxiv.org/abs/astro-ph/9908195v2

Mon.Not.Roy.Astron.Soc. 325 (2001) 1190

Astronomy and Astrophysics

Astrophysics

14 pages, 3 encapsulated figures. Accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04539.x

I study the evolution of haloes density profiles as a function of time in the SCDM and LCDM cosmologies. Following Del Popolo et al. (1999), I calculate the concentration parameter c=r_v/a and study its time evolution. For a given halo mass, I find that c(z) ~1/(1+z) both in the LCDM and SCDM cosmology, in agreement with Bullock et al. (1999) analytic model and N-body simulations. In both models, a(z) is roughly constant. The present model predicts a stronger evolution of c(z) with respect to Navarro et al. (1997) model. Finally I show some consequences of the result on galaxy modelling.

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